600

625

650

675

700

725

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

290.0

290.5

291.0

291.5

292.0

292.5

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

488

490

492

494

496

498

500

502

504

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

850

875

900

925

950

975

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

594

595

596

597

598

599

600

601

602

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

300

301

302

303

304

305

306

−40 −25 −10

5

20

35

50

65

80

95

110 125

Junction Temperature (°C)

7

TPS56221

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SLUSAH5D – MARCH 2011 – REVISED FEBRUARY 2016

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Copyright © 2011–2016, Texas Instruments Incorporated

6.6 Typical Characteristics

Figure 13 to Figure 18 are measured on a 2.5 inch × 2.5 inch, 0.062 inch thick FR4 board with 4 layers and 2-oz. copper, a

0.32-µH output inductor and a DCR of 0.32 m

Ω.

Figure 1. Reference Voltage vs. Junction Temperature

Figure 2. Switching Frequency vs. Junction Temperature

(300 kHz)

Figure 3. Switching Frequency vs. Junction Temperature

(500 kHz)

Figure 4. Switching Frequency vs. Junction Temperature (1

MHz)

Figure 5. EN Pin High-Level Threshold Voltage vs. Junction

Temperature

Figure 6. EN Pin Low-Level Threshold Voltage vs. Junction

Temperature